Reflector-shade



A. L. AREN'BERG.

REFLECTOR SHADE.

APPLICATION FILED AUG. 18, 1919.

Patented Mar. 30, 1920.

//v VE/V 70/? A L BLYPT A A mas/BER llll i trated so as to produce,

earers,

Application filed August 3th, 1919.

as nitrogen filled or gas filled lamps,

these usually having the filament concenas near as possible, a point source or light. Une oil the objects oi the invention is to provide a refiector shade of this character which shall refiect.

most or the light downward and outward, but shall at the same time permit a moderate amount to be directed upward toward the ceiling so as to give a cheeritul eflect to the room in which the fixture is placed. llt is my purpose, among other things, to prevent the direct unshaded rays of the lamp trcin striking the eyes out a person standing at some distance away from the fixture, thus avoiding eye strain to those located where the firiture might readily come within natural range oi vision. llt is my purpose in connection with the :lioregoing characteristies to obtain a shade which will reduce to a minimum the absorption ct light common in ordinary reflectors, especially where the light rays are torced to pass through one or more layers of glass before reaching their ultimate objective. llt is also my, purpose to obtain complete dii'lusion so as to avoid all sharply defined shadows. lln connection with the foregoing, another object is to produce a fixture which shall have a pleasing appearance. Still another object is to provide a shade which shall be dustprooit, thus keeping it efi icient in transmit ting and reflecting light and eliminating the factor of attendance to keep it'clean. in carrying out these objects, according to the particular design illustrated, the entire device is made of a single piece of glass or similar material.

it obtain my objects by the construction illustrated in the accompanying drawing which is an atrial section of adevice embodying my invention, the same being shown with a lamp and a shade holder in position.

Specification oi Letters Patent.

Reflector-Shades, of

.duce a moderate face .22, hereinafter mentioned.

4 ing downward Patented lltltar. Hill, llhdtlt serial no. maria. I

lln the term illustrated, my shade is supported by a shade holder 1 having the usual set screws. 2. fiaid shade holder is suspended by a chain ,3 or and is provided with a soclret l tor the lamp 5. in this case the lamp has a filament 6 which is concentrated in a comparatively small compass so as to attend practically a point source.

Referring now to the parts more intimately concerned with the invention, the reflector shade has a central. chamber llfi having approirimately cylindrical sides ill and a convert closed bottom 12.. lln the preiterred term, illustrated, the entire device made oi? a single piece oi clear covered,

over certain areas, with enamel all one den-- sity or another as will be hereinafter pointed out. lln the illustrated. case, a layer 13 oil enamel. of single density covers the entire bottom oi? the central chamber up to a point almost level with the filament t. The re maining portion ot the central. chamber is or clear glass, the result being that the rays which project appreciably below the level oil the filament are partially transmitted and are partially reflected upward and lat-- orally. lrluclfot the downward and later-- ally projecting rays as are transmitted prolighting efit'ect on the area beneath, thus protecting the eyes against a too strong light and at the same time preventing them from seeing a definite point source oil light. llheserays are dittused and softened and impart a cheertul appearance to the central portion oil the fiirture, but at the same time avoid eye strain. 'llhose rays; that pass through the clear portion ll and constitute perhaps halt of the total issuing from the filament, strike the retlecting sur- The rays that pass more or less directly upward are reflected by means oil an opaque detlector 14- which may be made or enameled steel.

Arching radially outward and downward from the top of the cylindrical walls ll oi the central chamber is a dome-lilre portion 16, the underside being concave and swingand outward to a point 17 which is, in the present desig approzrimately on a level with the lower end oi the central chamber. All this point the shade rounds outward and thence upward to torm an outer wall 18 which by preference is approximately cylindrical and rises to a height similar suspending means till roe

llltl appreciably greater than the level of the I. may be termed the upward upper end of the central chamber. The wall 18 and the adjacent portion of .the inner dome 16' form a'hollow annular flange portion-for the shade. Extending inward and from. the top of theannular-wall which for convenience outer dome or root of the shade. This roof portion is shown as being approximately frusto conical although it may be more or less rounded if desired.

18 is a portion 19 'It terminates in a collar 20 adapted to seat '1 upon the set screws 2.

'some distance away I be confined within a but 'at the sametime 'largely g the shade where it will take the course of The lower edge 17 is low enough to intercept such light rays as pass through the w all This causes the major portion of light to.

proper area and at the same time diflz'used so as to avoid any sharp images of the light source and to avoid any sharp shadows of objects in the room.

The outer side wall 18 has a layer 23 of single density dimming the light rays passing through it imparting a cheerful, attractive appearance .to the fixture. But the portion of light not transmitted is reflected back into the interior of the other rays there.- i

The upper dome or roof 19 is preferably Y of clear glass and thus transmits the light which comes to it; but in view of the presence of the deflector 1i and enamel 22, only enough light erate quantity of light onto the ceiling.

dark ceiling is cheerless and unattractive and with my device this condition is avoided and the ceiling lighted to a proper degree.

It-will be evident that in practice not only will the entire shade and the adjacent area of the ceiling present a luminous appearance, but a large portion of the emanation will be reserved for'the lighting of a reasonable amount of area beneath. This is where the bulk of the light is wanted,-and this is where it is directed by my device. Nevertheless, there is no position, in practice, where a person will receive rays direct and undimmed from the light source. Hence, the efiect is grateful to the eyes and the fixture is. also eflicient in directing the rays where most beneficial.

I wish to point out that in the preferred face of the lower dome of double density/ y,

enamel which is capable'of' r-passing through the upper,

the side nearestthe llght source,

will reach it to throw a modconstruction, as illustrated, the convenient and natural place for the enamel is on the lower rather than the upper (internal) sur- 16, and the enamel, when so placed, and as I have placed it, periorms its reflecting function before and not after the rays have penetrated the glass on which the enamel is mounted. 'In fact,

the layers 22 largely prevent the rays from reaching the glass 16 and hence avoid the absorption, and consequent waste of light which occurs whenever light passes through even the clearest of glass- Thus my device is not only attractive and throws the light where needed, but actually reduces the loss of energy to a minimum.

Another important advantage possessed by my shade is that it is dust proof. There is no opening at the bottom and if the shade holder is properly fitted, no dust can enter. The result is that no cleaning is practically speaking, and the light is never dimmed by having to pass through a layer of dust.

Having thus described my invention, what I claim as new and desire to secure by Letters ,Patent, is

1. A lighting unit having a central glass chamber adapted to contain a source of light, said chamber being adapted to substantially inclose the source of light and the upper portion being of clear glass, said chamber having an integral, glass, annular extension at the top extending outward and located in position to be struck by the light clear glass portion of the central chamber, said extension having a substance ap lied to its surface on said substance being capable of transmitting a portion of the light, but adapted to reflect the major portion of said light.

- 2. A reflector shade having a central chamlber adapted to contain a source of light, an inner dome extending outward and downward from the top of the central chamber and an outer dome arranged above the inner dome and spaced from it, the outer dome having at its periphery a depending flange; connecting with the periphery of the inner dome, the upper portion of the central chamber being adapted to transmit practically all of the light rays striking it and the inner dome being adapted to reflect downward and outward the rays which reach it through the said upper portion of resent-t the central ehamloer, and a glass dome above said extension, integral With it at the annular rim thereof, said dome being adapted to transmit some of the light rays striking it from the inside, and enamel applied to the underside of said extension, said enamel being adapted to relleet the major portion of the light striking it and to transmit a small portion of such light to thereby irnpart subdued illumination to the dome.

ln Witness whereof l have hereunto sub" seriloed my name,

ALBERT ll upper to 

